What should I tell my doctor before taking VELTASSA? Before you take VELTASSA, tell your doctor about all of your medical conditions, including if you: have problems having a bowel movement, including if you have severe constipation, a blockage (obstruction) in your bowel, or dry hard stool that will not pass out of your rectum (impaction) have problems with your bowels after surgery Know the medicines you take. Keep a list of them to show your doctor and pharmacist when you get a new medicine. Tell your doctor about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.